Hmm..surveying taxi waiting time...
http://singapore.gumtree.sg/c-Jobs-part-time-evening-weekend-Free-Lance-Taxi-Surveyor-W0QQAdIdZ369833367
My two phuiddies in bus forum very good experience at such thing .
Stay Toa Phuiyoh and PhuiShan the two phuis are two specialists .
Surveying waiting is just one of them .
Some others included expressway travelling time , AP transport waits , etc
ERP that caused taxi to be lesser